I know this topic has been discussed b4. Currently my car has 60K miles and I'm using Mobil 1 0W-40 but I want to switch to something better I was thinking Amsoil. My car as DCI and JB4. When I check the oil level its halfway and the oil was changed at 58,700 miles. I don't really see any smoke or any weird things the car feels good. I know the N54 is known for eating oil and running hottt!!!